“…Alternatively you could admit that CO2 is not a greenhouse gas, accept that sea levels are not rising, that polar bears are breeding well (thanks), ” – Bearsy (here/today)

As a serious comment, this is so ridiculous as to be scary. In fact, I would prefer to hope that Bearsy was being ironic?… It is one thing to claim that CO2 is not the only GHG and that, say, water vapour is more important (more on that next week) but, quite another to claim that CO2 is not a GHG at all (i.e. to deny the heat-absorbing properties of the gas that are observable, measurable, and repeatable in a lab and predictable in reality). When I say predictable, I mean that pretty much everyone who has attempted to do the maths since Svante Arrhenius has concluded that a doubling of atmospheric CO2 (from any baseline value you chose) will cause a 3 degree celsius rise (20-30 yr time lag and ALL positve feedbacks notwithstanding)… Therefore, CO2 is now 140% of pre-industrial levels but, despite this non-linear relationship, global average temperatures are rising as expected.

Sea level rise may be harder to predict, and also subject to negative feedback delays but, those that have reason to be most worried are measuring it carefully; and this has nothing to do with them having OCPD either! Given that rivers and glaciers are contribuitng ever-increasing amounts of “palaeo-water”; and that what goes up (evaporation) must come down (precipitation); it is very hard to avoid the conclusion that sea levels must rise as a result.

As for the polar bears, well, despite stupid comments about them being able to survive in Mediterrranean zoos (where they are fed by humans!), the continuing (if not accelarating) reduction of sea ice every summer puts their long-standing behaviour patterns at odds with changing climatic reality; and their food harder to come buy (in the wild at least!). So, this too is just an unbelievably stupid assertion.

Will your next trick, as Douglas Adams once put it, be to claim that black is white and get yourself runover on a zebra crossing? We can but hope.